Improved machine for nicking heads of screws



UNITED STATES PATENT y OEEICE..

IRA GRIGGS, OF UTIOA, NEW YORK, ASSIGNOR TO THE UTIOA SCREW MANU- FAOTURING COMPANY.

IMPROVED MACHINE FOR NICKING HEADS OF SCREWS.

Specification forming part of Letters Patent No. 23,569, dated April 12, 1859.

T0 all whom it may col/1.067%:

Be it known that l, IRA GRIGGS, of Utica, in the county of Oneida and Stateof New York, haveinvented certain newand useful Improvements in Machinery for Notching the Heads of Screws; and I do hereby declare that the followingisafull, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this speciiication, in which- Figure l is a longitudinal vertical section taken directly through the holding-dies of a screw-notching machine constructed according to my invention. Fig. 2 is alongitudinal vertical section of the carrier close to the feeding-slide. Fig. 3 is a plan of the same with part of the saw-spindle broken away to expose the parts of the machine below it.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in a certain novel means of presenting the screw-blanks to the notching-saw; and it also consists in acer-tain novel mode of discharging the blanks from the machine after the notches have been cnt.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A is a horizontal frame supported on suitable standards A A; and having erected upon it two standards B B, which carry the center screws a a, between which the horizontal sawspindle O is supported, and two standards I) D, which contain the bearings for a horizontal shaft E, which is arranged parallel with,bntlower than, the saw-spindle. The shaft E derives rotary motion from the saw-spindle, or the saw-spindle from the said shaft E, through the agency of an intermediate shaft H, which is geared with the said shaft E by gears I J and which carries a pulley K, around which and around a pulley L on the saw-spindle runs a band b. The rotary motion of the shaft E is very slow compared with that of the saw-spindle.

F is what I term the carrier, consisting of an oblong box extending from the shaft E forward directly under the spindle and saw G, and having its rear end connected with the said shaft E by means of two journalboxes d d, which are secured rigidly to the said box and fitted to journals on the said shaft, and which permit the carrier to receive a vertical swinging motion upon the ,said shaftfor the purpose of presenting the screwblanks, which are supplied to and held in the front portion of the carrier, as hereinafter described, to the action of the notching-saw G,

and withdrawing them therefrom after the notches have been cut. The swingingmotion of this carrier is derived fromacam M on the shaft E, which cam acts upon alever N, which works upon a fulcrum c, and which supports the front end of the carrier, and the carrier is guided in such motion by workingbetween one of the standards B and a standard B', erected for the purpose. l

The carrier F contains a stationary die P, which is adjustable longitudinally of the said carrier by means of a set-screw e working through the front of the said carrier; and it also contains side by side a sliding die R and a wedge-pointed feeding-slider Q, which are covered by a plate f, which is represented as broken away in Fig. 3 to expose them. The dies P R have corresponding seinicircular or nearly seinicircular recesses in their opposite faces to receive the Shanks of the screw-blanks and hold them firmly below the saw during the notching operation. The die R is forced and held toward the die P, to secure the blanks by the action upon its rear end of a cam S on the shaft E, said cam having its periphery of the form of from three-fourths to seveneighths of a circle, with a recess g g, (dott-ed in Fig. 1,) into which the die is forced back by a spring 7L applied in a recess within the carrier at the proper time to liberate the blanks-viz., during or just after the descent of the carrier. The die R need not move back far enough to let the heads of the screw-blanks drop through, but only far enough to let the shank be pushed out sidewise, so that it may drop through a wide opening l in the carriers by the next blank, which is forced between the dies from the inclined feedway T bythe feedingslider Q, which works through a groove in the lower end of said feedway. The slider Q is driven forward to force the new blank between the dies and force out the one which has been notched just before the ,advance of the die R and before the carrier has risen high enough to present the head in contact With the saw, said forward movement being produced by a cam U on the shaft E, and as soon as the new blank has been secured by the advance of the die R, which follows immediately the advance of the feeding-slider Q, the latter is forced back by ,a spring i, which is arranged in a recess Within the carrier. To prevent any injury being produced by the advance ot' the feeding-slider Q when there is any obstruction in front of it, I make it in two pieces, with an interposed spring j. This spring must be stronger than the spring z', Vwhich must be applied to the front piece of the slider.

The inclined feedway T is of the usual construction,andhasa hopperVat its upperend to keep it supplied. Its upper end is secured to a standard T and its lower end to the carrier F, and its elasticity should be suficient to enable it to yield to the movement of the carrier, which will have the effect of agitating it and causing the ce1-tain descent of the blanks `along it.

The depth ofthe notches is regulated bya screw W, which screws through the front portion of the carrier and supports the same on the lever N. This screw, it is obvious, will serve t0 elevate the carrier above the lever N as muchas may be desirable, and the more the carrier is elevated the deeper will be the cut, and vice versa. Every revolution of the shaft E causes the carrier to be slowly ele- 4 vated by the action of the cam M upon the leg ver N to present a blank to the operation of the saw and afterward tov be quickly depressed, and it is during or immediately after this depression that the discharge of the notched blank and the introduction of the new blank, as hereinabove described, takes place. By discharging the notched blanks from the holding-dies by pushing them out laterally by the introduction of -the new blanks, instead of by opening the dies Wide enough for the heads to drop through, as is commonly practiced, I not only simplify the machine,butam enabled t drive it at a higher velocity. As in the last-mentioned mode of operation, the diesafter having opened Wide enough to let the blank out, have -to partly close before the new one can be introduced.

What I claim as `my invention, and desire to secu re by Letters Patent, is

l. The arrangement of the holding-dies and feeding-slider in a carrier F, which swings upon vthe same shaft which carries the cams for operating the said dies and slider and operates in combination with the notching-saw, substantially as herein described. l

2. The discharging of the notched blanks from the holding-dies in a lateral direction by the introduction of the newblanks into the said dies, as herein set forth.

IRA GRIGGS.

Witnesses:

GEORGE S. DANA, SAMUEL A. HERRIOK. 

